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| 型号： | DS21Q348N |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 42/76页 |
| 文件大小： | 0K |
| 描述： | IC LIU T1/E1/J1 QUAD 3.3V 144BGA |
| 标准包装： | 90 |
| 类型： | 线路接口装置（LIU） |
| 规程： | E1 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 144-BBGA |
| 供应商设备封装： | 144-PBGA（17x17） |
| 包装： | 管件 |
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DS21348/DS21Q348
47 of 76
6.3 PRBS Generation and Detection
Setting TPRBSE (CCR3.4) = 1 enables the DS21348 to transmit a 215 - 1 (E1) or a 220 - 1 (T1) Pseudo-
Random Bit Sequence (PRBS) depending on the ETS bit setting in CCR1.7. The receive-side of the
DS21348 will always search for these PRBS patterns independent of CCR3.4. The PRBS Bit Error
Output (PBEO) will remain high until the receiver has synchronized to one of the two patterns (64 bits
received without an error) at which time PBEO will go low and the PRBSD bit in the Status Register
(SR) will be set. Once synchronized, any bit errors received will cause a positive going pulse at PBEO,
synchronous with RCLK. This output can be used with external circuitry to keep track of bit error rates
during the PRBS testing. Setting CCR6.0 (ECRS) = 1 will allow the PRBS errors to be accumulated in
the 16-bit counter in registers ECR1 and ECR2. The PRBS synchronizer will remain in sync until it
experiences 6 bit errors or more within a 64-bit span. Both PRBS patterns comply with the ITU-T O.151
specifications.
6.4 Error Counter
Error Count Register 1 (ECR1) is the most significant word and ECR2 is the least significant word of a
user selectable 16-bit counter that records incoming errors including BiPolar Violations (BPV), Code
Violations (CV), Excessive Zero violations (EXZ) and/or PRBS Errors. See Table 6-3 and Table 6-4 and
Figure 1-2 for details.
Table 6-3. Definition of Received Errors
ERROR
E1 OR T1
DEFINITION OF RECEIVED ERRORS
BPV
E1/T1
Two consecutive marks with the same polarity. Will ignore BPVs due to
HDB3 and B8ZS zero suppression when CCR2.3 = 0. Typically used with
AMI coding (CCR2.3 = 1). ITU-T O.161.
CV
E1
When HDB3 is enabled (CCR2.3 = 0) and the receiver detects two
consecutive BPVs with the same polarity. ITU-T O.161.
EXZ
E1
When four or more consecutive zeros are detected.
EXZ
T1
When receiving AMI coded signals (CCR2.3 = 1), detection of 16 or more
zeros or a BPV. ANSI T1.403 1999.
When receiving B8ZS coded signals (CCR2.3 = 0), detection of 8 or more
zeros or a BPV. ANSI T1.403 1999.
PRBS
E1/T1
A bit error in a received PRBS pattern. See Section 6.3 for details. ITU-T
O.151.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS21Q348NB | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q348-W | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q352 | 功能描述:网络控制器与处理器 IC 3.3/5V Quad T1/E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q352B | 功能描述:网络控制器与处理器 IC 3.3/5V Quad T1/E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q352B+ | 功能描述:网络控制器与处理器 IC 3.3/5V Quad T1/E1 Transceiver RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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